Added server URL setup step to tutorial
Added server URL setup step to tutorial

It's always a good practice not to change original frameworks files.

djz-code/countly-sdk-ios,erkanyildiz/countly-sdk-ios,Countly/countly-sdk-ios,Countly/countly-sdk-ios,erkanyildiz/countly-sdk-ios,IntergalacticInteractive/countly-sdk-ios,taptaptap/countly-sdk-ios,adan016/countly-sdk-ios,Navirize/countly-sdk-ios,erkanyildiz/countly-sdk-ios,Countly/countly-sdk-ios